In providing a service over the internet into other EU countries, from a website hosted in Ireland, an internet service provider will typically want to ensure that if there is a dispute with a user of the service, that the dispute can be litigated in Ireland.
The Brussels Regulation (which determines which courts have jurisdiction in civil and commercial disputes between companies and individuals) at article 2 provides (subject to some exceptions including that set out in article 23) that a person (legal or natural) may only be sued in the member state in which he or she is domiciled.
One of the issues that a previous decision of the European court of justice had argued, was that an EU member state court could have exclusive jurisdiction where there was a validly concluded jurisdiction clause, even where there was a dispute as to the validity of the agreement in which the clause was included.
The judgement provides some encouragement to web site owners, that if their web site terms are sufficiently well drafted (including incorporating a home state jurisdiction clause), and are brought properly to the attention of site users, that the onerous provision of article 2 of the Brussels Regulation can be avoided and home state jurisdiction maintained. It remains to be seen whether the Supreme Court will uphold this decision.